The hypothesis of this trial is that treatment with the NAVISTAR(R) THERMOCOOL(R) Catheter, with CARTO(R) 3 System guidance, will provide superior efficacy and safety for the treatment of paroxysmal atrial fibrillation vs.

Paroxysmal atrial fibrillation (PAF) is characterized by a rapid rhythm of the heart's upper chambers that starts suddenly and stops without the need for medical intervention, yet can provoke severe symptoms.

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